package com.jie.config;
import com.jie.common.JacksonObjectMapper;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.List;

@Configuration
public class WebMvcCfg implements WebMvcConfigurer {



    //扩展mvc框架的消息转换器
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        //创建消息转换器对象
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        //设置对象转换器，底层使用jackson将java对象转为json
        messageConverter.setObjectMapper(new JacksonObjectMapper());
        //将上面的消息转换器对象追加到mvc框架的转换器集合中,底层是有顺序的0，则优先使用自己定义的对象转换器
        converters.add(0,messageConverter);
    }

}
